Smart Youtube allow you to insert video and playlists into your WordPress post and in your RSS feed. It is perfectly work son Works on iPhone, iPad and iPod etc and issues a sidebar widget for videos as well.
WP YouTube act as a a profile editor, where you can set up different settings, but only one profile is needed for all your YouTube videos.
TubePress is an open source PHP library to display Vimeo videos, YouTube and galleries on WordPress website.
Youtube Brackets allows placing a YouTube URL link in brackets, which automatically displays the embedded video code after publishing.